Lexus SC300 / Lexus SC400. Service manual — part 555

(b) Determine the replacement adjusting shim size

following Formula or Charts:

•

Using a micrometer, measure the thickness of the
removed shim.

•

Calculate the thickness of a new shim so the valve
clearance comes within specified value.

T Thickness of used shim
A Measured valve clearance
N Thickness of new shim

Intake N = T + (A–0.20 mm (0.008 in.))
Exhaust N = T + (A–0.30 mm (0.012 in.))

•

Select a new shim with a thickness as close as
possible to the calculated values.

HINT: Shims are available in thirty–three sizes in increments
of 0.025 mm (0.0010 in.), from 2.50 mm (0.0984 in.) to 3.30
mm (0.1299 in.).
(c) Install a new adjusting shim.

•

Place a new adjusting shim on the valve lifter.

•

Press down the valve lifter with SST (A), and
remove SST (B).

SST 09248–55011
(d) Recheck the valve clearance.

–

ENGINE MECHANICAL

Engine Tune–Up

EM–19

Adjusting Shim Selection Chart (Intake)

EM–20

–

ENGINE

MECHANICAL

Engine T

une–Up

–

ENGINE MECHANICAL

E

n

g

in

e

T

une–up

EM–21

Adjusting Shim Selection Chart (Exhaust)

23. REINSTALL THEFT DETERRENT HORN

(a) Install the theft deterrent horn with the bolt.
(b) Connect the connector.

24. REINSTALL RH CYLINDER HEAD COVER

(a) Remove any oil packing (FIPG) material.
(b) Apply seal packing to the cylinder head as shown in the

illustration.

Seal packing: Part No. 08826–00080 or equivalent

(c) Install the gasket to the cylinder head cover.
(d) Install the seal washer to the mounting bolt.
(e) Install the cylinder head cover with the eight bolts.

Torque: 5.9 N

⋅

m (60 kgf

⋅

cm, 52 in.

⋅

lbf)

(g) Connect the four high–tension cords to the spark plugs.
(h) Install the rear and front high–tension cord clamps with

the two bolts.

HINT: Place the front and rear ends of the front high–tension
cord clamp on the rear high–tension cord clamp and lower
high–tension cord cover.
(i) Fit the high–tension cords to the high–tension cord

clamps. (See page

IG–16

)

25. REINSTALL LH CYLINDER HEAD COVER

(a) Remove any oil packing (FIPG) material.
(b) Apply seal packing to the cylinder head as shown in the

illustration.

Seal packing: Part No. 08826–00080 or equivalent

EM–22

–

ENGINE MECHANICAL

Engine Tune–Up